Datasheet

LTC3422
4
3422fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Single Cell to 3.3V Efficiency 2-Cell to 3.3V Efficiency Li-Ion to 5V Efficiency
Burst Mode Operation Load Transient Response Inrush Current Control
Efficiency vs Frequency Efficiency vs V
IN
Start-Up Voltage vs Output Current
OUTPUT CURRENT (mA)
1
40
EFFICIENCY (%)
50
60
70
80
10 100 1000
3422 G07
30
20
10
0
90
100
V
IN
= 2.4V
V
OUT
= 3.3V
f
OSC
= 300kHz
f
OSC
= 3MHz
f
OSC
= 1MHz
INPUT VOLTAGE (V)
1
EFFICIENCY (%)
40
50
100
70
2
3
3.5
3422 G08
80
90
60
1.5 2.5
4
4.5
5
f
OSC
= 1MHz
V
OUT
= 3.3V
PWM AT 200mA LOAD
OUTPUT CURRENT (mA)
0
START VOLTAGE (V)
1.00
1.05
1.10
200
3422 G09
0.95
0.90
50
100
150
0.85
1.20
1.25
1.15
V
OUT
50mV/DIV
AC COUPLED
SW
2V/DIV
INDUCTOR
CURRENT
0.5A/DIV
V
IN
= 2.4V
I
LOAD
= 20mA
2µs/DIV
3422 G04
V
OUT
100mV/DIV
AC COUPLED
I
OUT
100mA/DIV
V
IN
= 2.4V
V
OUT
= 3.3V
C
OUT
= 22µF
200µs/DIV
3422 G05
300mA
50mA
V
OUT
1V/DIV
INDUCTOR
CURRENT
100mA/DIV
V
IN
= 0V TO 2.4V
V
OUT
= 3.3V
C
OUT
= 22µF
100mA LOAD CURRENT
500µs/DIV
3422 G06
(T
A
= 25°C, unless otherwise specified)
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3422 G01
0
1
BURST
EFFICIENCY
V
IN
= 1.6V
V
IN
= 1.25V
V
IN
= 0.9V
PWM
EFFICIENCY
V
IN
= 1.6V
V
IN
= 1.25V
V
IN
= 0.9V
f
OSC
= 1MHz
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3422 G02
0
1
PWM
EFFICIENCY
V
IN
= 3V
V
IN
= 2.4V
V
IN
= 1.8V
f
OSC
= 1MHz
BURST
EFFICIENCY
V
IN
= 3V
V
IN
= 2.4V
V
IN
= 1.8V
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3422 G03
0
1
BURST
EFFICIENCY
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 3.1V
PWM
EFFICIENCY
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 3.1V
f
OSC
= 1MHz